There are many types of pigmentation and they are caused by many factors. The following are the top three forms of hyperpigmentation:
Lentigines: This pigmentation is caused by excessive exposure to UV rays from the sun. These spots can appear in a scattered pattern and are usually seen in people over the age of 60, although many younger men and women may have sun-related dark spots.
Melasma: Hormonal changes are the root cause of this sort of dark skin condition. Women, in particular, may notice dark spots appearing on their skin during periods when their hormones are running high, especially during events such as pregnancy or menstruation. Melasma can also occur as a result of birth control pills, hormone therapy treatment, or thyroid dysfunction.
Post-Inflammatory Hyperpigmentation (PIH): These dark spots can be caused by trauma to the skin, including burns, acne, and certain skin care treatments that are harsh on the skin.